<template>
	<view>
		<view class="search-box">
			<uni-search-bar @confirm="search" @input="input" :radius="100" cancelButton="none"></uni-search-bar>
		</view>
		
		<!-- 搜索建议列表 -->
		<view class="sugg-list" v-if="searchResults.length !== 0">
			<view class="sugg-item" v-for="(item, i) in searchResults" :key="i" @click="gotoDetail(item)">
				<view class="goods-name"> {{item.goods_name}} </view>
				<uni-icons type="forward" size="16"></uni-icons>
			</view>
		</view>
		
		<!-- 搜索历史 -->
		<view class="history-box" v-else>
			<!-- 标题区域 -->
			<view class="history-title">
				<text>搜索历史</text>
				<uni-icons type="trash" size="17" @click="cleanHistory"></uni-icons>
			</view>
			<!-- 列表区域 -->
			<view class="history-list">
				<uni-tag :text="item" v-for="(item, i) in historys" :key="i" @click="gotoGoodsList(item)"></uni-tag>
				
			</view>
		</view>
	</view>
</template>

<script>
	export default {
		data() {
			return {
				timer: null,
				keyWord: '',
				// 搜索的结果列表
				searchResults: [],
				historyList: []
			};
		},
		
		onLoad() {
			// 读取拿到存储的历史记录数据
			this.historyList = JSON.parse(uni.getStorageSync('kw') || '[]')
		},
		
		methods: {
			input(e) {
				// 清楚timer延时器
				clearTimeout(this.timer)
				
				this.timer = setTimeout(() => {
					// 如果500毫秒内 没有触发新的输入事件 则为搜索关键词赋值
					// console.log(e)
					this.keyWord = e.value
					this.getSeachList()
				}, 500)
			},
			
			async getSeachList() {
				if (this.keyWord.trim() === '') {
					this.searchResults = []
					return
				}
				
				const {data: res} = await uni.$http.get('/api/public/v1/goods/qsearch',{ query: this.keyWord })
				if (res.meta.status !== 200) return uni.$showMsg()
				this.searchResults = res.message
				
				this.saveSearchHistory()
			},
			
			gotoDetail(item) {
				uni.navigateTo({
					url: '/subpkg/goods_detail/goods_detail?goods_id=' + item.goods_id
				})
			},
			
			saveSearchHistory() {
				// this.historyList.push(this.keyWord)
				// this.historyList.unshift()(this.keyWord)
				const set = new Set(this.historyList)
				set.delete(this.keyWord)
				set.add(this.keyWord)
				//console.log(set)
				this.historyList = Array.from(set)
				// 进行持久化存储
				uni.setStorageSync('kw', JSON.stringify(this.historyList))
			},
			
			// 清空历史
			cleanHistory() {
				this.historyList = []
				// uni.setStorageSync('kw', '[]')
				uni.removeStorageSync('kw')
			},
			
			// 历史记录的跳转
			gotoGoodsList(kw) {
				uni.navigateTo({
					url:'/subpkg/goods_list/goods_list?query=' + kw
				})
			}
		},
		
		// 计算属性
		computed: {
			historys() {
				// 新建一个内存无关的数组，在进行反转
				return [...this.historyList].reverse()
			}
		}
	}
</script>

<style lang="scss">
	.search-box {
		position: sticky;
		top: 0;
		z-index: 999;
	}
	
	.sugg-list {
		padding: 0 5px;
		.sugg-item {
			display: flex; //横铺
			align-items: center; //居中
			justify-content: space-between; //两边贴边
			font-size: 12px;
			padding: 13px 0;
			border-bottom: 1px solid #efefef;
			
			.goods-name {
				white-space: nowrap; //不换行
				overflow: hidden;	//超出隐藏
				text-overflow: ellipsis; //...显示
			}
		}
	}
	
	.history-box {
		padding: 0 5px;
		
		.history-title {
			display: flex;
			justify-content: space-between;
			height: 40px;
			align-items: center;
			font-size: 13px;
			border-bottom: 1px solid #efefef;
		}
		.history-list {
			display: flex;
			flex-wrap: wrap;

			.uni-tag {
				margin-top: 5px;
				margin-right: 5px;
			}
		}
	}
</style>
